Upright Ultra-Low Temperature (ULT) Freezer 780 Litre

The Stirling Ultracold is the most reliable and energy-efficient upright ultra-low temperature (ULT) freezers available (Compared to other compressor-based ULT’s).

  • Costs less to operate
  • Saves valuable laboratory space
  • Reduces your energy use

Some traditional compressor based units do fail, putting your valuable samples at risk.
However the SU780XLE uses Stirling engine technology, which outlasts such compressors and is guaranteed to keep your samples safer and for longer.


• ± 1°C Steady-state temperature variation over time
• Faster initial pull-down, ambient to -80°C, <6.5 hours
• Fastest door opening temperature recovery, 35 minutes to -80°C (when tested using the ENERGY STAR® Final Test Method door opening procedure)
• Connectivity available to BMS/BAS or 3rd-party monitoring system
• Real-time temperature display
• Largest storage capacity per sq. ft. of floor space
• Plugs into any outlet
• 70-75% less energy than standard compressor-based systems
• Steady State Energy Use 6.67 kWh/day at -75°C (Weighted Average)

Technical Specification

Volume (Litres): 780
Operating Temperature (°C): ‐20 to ‐86
External Dimensions; W x D x H (mm):  915 x 870 x 1994
Internal Dimensions; W x D x H (mm):  740 x 705 x 1542
Weight (Kg): 284
Insulation: High performance vacuum insulated panels and polyurethane foam using Ecomate®
environmentally friendly, SNAP‐compliant blowing agent
Doors: Outer 1 / Inner 3
Shelving: x2 (adjustable)
Compartments: 600 x 2” Boxes (Optional 700 Box system available)
Noise (dBA): < 45
Ambient Operating Temperature (°C): +5 to +35
Cooling Engine: Helium charged free‐piston Stirling engine with continuous modulation
Heat Transport System: Gravity driven thermosiphon
Refrigerant: R‐170 (Ethane) 90 grams
Evaporator: Cold wall (inner liner)
Heat Rejection: Finned heat exchanger with forced air cooling

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